General

  • Target

    a20ae981add30ca8ca3ff698bc6afcf5a6e650fa5848f5f82839171e39495b78

  • Size

    418KB

  • Sample

    220521-n3f57ahffk

  • MD5

    03071dc17e2366ceb5cf5968ae4dd186

  • SHA1

    0135b9682db4667e961bd1746ce23004096dff8d

  • SHA256

    a20ae981add30ca8ca3ff698bc6afcf5a6e650fa5848f5f82839171e39495b78

  • SHA512

    573c316b3e2a42f7f3baa2f0130945bd41b83ed656a2c4ef679ac103dfa2413bdd7e73883264b2a3d3333e6156185002e40443395d60a8959d848e3ae403773d

Malware Config

Extracted

Family

agenttesla

Credentials

  • Protocol:
    smtp
  • Host:
    smtp.yandex.com
  • Port:
    587
  • Username:
    kclogs2020@yandex.com
  • Password:
    j4k4rtakc

Targets

    • Target

      mXb7YbGSNVuPq6D.exe

    • Size

      509KB

    • MD5

      b5b4f6b0c037dbd2f1c780d003e2048c

    • SHA1

      6cf7271e167a649fcd60f016a3e23d0d6a08a2ac

    • SHA256

      38a5466ed6bf2ea0c3e206b7ce9520da9c0104fbe0ddc33012ef73087e0c754c

    • SHA512

      fec5dde56e01735e4cca1ea17c106b003c27f02ef38abd60a9768a22344a1c580f14fc48b016770db0d9f1287213d14386321daee857bc5cc37032989e4e512b

    • AgentTesla

      Agent Tesla is a remote access tool (RAT) written in visual basic.

    • CoreEntity .NET Packer

      A .NET packer called CoreEntity where it has embedded the payload as a BitMap object which is later decrypted.

    • AgentTesla Payload

    • Looks for VirtualBox Guest Additions in registry

    • ReZer0 packer

      Detects ReZer0, a packer with multiple versions used in various campaigns.

    • Looks for VMWare Tools registry key

    • Checks BIOS information in registry

      BIOS information is often read in order to detect sandboxing environments.

    • Checks computer location settings

      Looks up country code configured in the registry, likely geofence.

    • Reads data files stored by FTP clients

      Tries to access configuration files associated with programs like FileZilla.

    • Reads user/profile data of local email clients

      Email clients store some user data on disk where infostealers will often target it.

    • Reads user/profile data of web browsers

      Infostealers often target stored browser data, which can include saved credentials etc.

    • Accesses Microsoft Outlook profiles

    • Adds Run key to start application

    • Maps connected drives based on registry

      Disk information is often read in order to detect sandboxing environments.

    • Suspicious use of SetThreadContext

MITRE ATT&CK Matrix ATT&CK v6

Execution

Scheduled Task

1
T1053

Persistence

Registry Run Keys / Startup Folder

1
T1060

Scheduled Task

1
T1053

Privilege Escalation

Scheduled Task

1
T1053

Defense Evasion

Virtualization/Sandbox Evasion

2
T1497

Modify Registry

1
T1112

Credential Access

Credentials in Files

3
T1081

Discovery

Query Registry

5
T1012

Virtualization/Sandbox Evasion

2
T1497

System Information Discovery

4
T1082

Peripheral Device Discovery

1
T1120

Collection

Data from Local System

3
T1005

Email Collection

1
T1114

Tasks